Accused drug smuggler Cassandra Sainsbury has opened up about her life in a Colombian women's prison and plans to clear her name - just days before she's due in court over her part in a bungled million-dollar drug operation.

The young boy, who has endured multiple brain surgeries and a major seizure after being diagnosed with Complex Epilepsy, breezed through his first day of training with members of the Australian Federal Police.

McGowan labels Barnett sad and bitter

Western Australian Premier Mark McGowan has accused his predecessor Colin Barnett of being bitter and acting without grace or dignity, likening his behaviour in parliament to former federal leaders Mark Latham and Tony Abbott.

In his first speech as a backbencher, Mr Barnett told parliament on Thursday that all the "preconditions" exist for another WA Inc scandal under the new Labor government.

Mr McGowan said on Friday that he had deliberately left Mr Barnett alone since the election, but the former premier's speech showed "an element of bitterness and lack of reality" that the member for Cottesloe had not dealt with.

"When you leave high office you can behave with dignity and grace, or you can act like Mark Latham and Tony Abbott, and Mr Barnett is following the Latham-Abbott route."

In his speech, Mr Barnett gave his observations of the state as an economist and the second longest serving premier in WA.

"There was in the 1980s an arrangement, a relationship between various prominent people in business at the time and the government of (Labor's) Brian Burke, Peter Dowding and Carmen Lawrence," he said.

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"That period ended up in what came to be known as WA Inc ... a premier and a deputy premier went to jail.

"The preconditions, particularly from the 1980s of a particular government, a Labor government, a particular characteristic of the business community of the time, and a typical characteristic of the media of the time are today replicated in Perth."

Asked whether Mr Barnett was fair game following his speech, Mr McGowan replied: "He's remained in parliament and he's launched some pretty untruthful political attacks and therefore he'll probably get some back.

"That's why former premiers, I think, should act with dignity and don't trash their own legacy by wearing their bitterness on their sleeve. Unfortunately, that's what he's doing."

The premier strongly denied WA was ripe for corruption similar to the WA Inc scandal.

He said Mr Barnett was "imagining things" and he should look into his own backyard given his government was so secretive.

"Clearly he's now cutting a sad and lonely figure and I think his wild accusations show a lack of dignity and a lack of grace," he said.

Mr McGowan said Liberal MPs were also uncomfortable with Mr Barnett's speech.

"When he was making his speech, they were all sitting there with their heads down and afterwards some of them told me how embarrassed they were," he said.